Powerflex Black Series Front Radius Arm to Chassis Bushes, Caster Adjustable, for BMW 1 Series F20 F21 95A Polyurethane Track/Motorsport Pair PFF5-1901GBLK Replaces 31126855743

Caster tuneable poly bush kit for BMW F20 F21 1 Series front tension strut to body

Transform steering precision and consistency with this track-focused bushing set from the Powerflex Black Series range. Fitted to the front tension strut to body position on the BMW F20 and F21 platforms, these performance bushes use a 95 Shore A compound to keep geometry stable under load, delivering crisper turn-in, better stability under braking and repeatable handling on circuit and fast road.

Part number: PFF5-1901GBLK
OEM reference it replaces: 31126855743

• Position: front lower control arm rear bush, also known as thrust arm or tension strut bush
• Compound: 95A polyurethane for maximum control of chassis alignment
• Stiffness: over 200 percent firmer than tired factory rubber to resist deflection
• On-car caster tuning: approx. plus or minus 0.75 degrees for sharper response and improved straight line stability
• Extra caster increases negative camber on turn to help the tyre stay planted during hard cornering
• Pack size: 2 bushes supplied as a matched pair
• Diagram reference: 1
• Usage: ideal for circuit use, time attack and serious performance builds
• Non adjustable alternative for this location: PFF5-1901BLK

Why enthusiasts choose this upgrade

Compared to the stock compliant rubber mount, this poly bush kit keeps the front end locked down so your alignment stays where you set it. The car feels more connected, with improved front end bite, better feedback through the wheel and more confidence on corner entry. We have installed and driven on these ourselves, and customer feedback has been consistently positive for track days and spirited driving.

Compatibility

BMW 1 Series F20 and F21 chassis. Front tension strut to body position, also referred to as the wishbone rear bush or front control arm rear mount.

What is included

• 2 x Black Series adjustable bush assemblies for caster correction
• Fitting components as supplied by the manufacturer

Fitting and alignment

Professional installation is recommended so caster can be set accurately on the car. A full four wheel alignment is strongly advised after fitting. For supply and installation, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search-friendly terms

BMW F20 F21 front lower control arm rear bushing kit, tension strut bush set, thrust arm mounts, caster correction bushes, FCAB upgrade, wishbone rear bush, 1 Series handling upgrade, poly bush kit for BMW, performance suspension bushes, geometry control bushings, track day suspension, motorsport bushing kit, negative camber on turn, steering response upgrade, Powerflex Black Series PFF5-1901GBLK, replaces 31126855743.